Marvair SP-SC Air.pdf - Marlow-Hunter, LLC

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SeaMach Reverse Cycle Air Conditioners and removed. Re-assemble. Be careful not to deform O-ring. Replace the four screws. Before sealing the face against the O-ring, open the seacock. Water should be leaking visibly from the pump face. Tighten screws. Water will stop leaking when proper seal is achieved. Do not over tighten. In this manner, you have primed the pump. Restart system. (If problem persists, see Troubleshooting.) Grilles and Proper Air Flow The most important thing to remember with all grilles, both supply and return air, is that they must never be restricted by objects such as bed linens, duffel bags, tackle bags, etc. Return Air Grille(s) and Filter(s) Return air grilles are available in both aluminum and wood in standard configurations. They do not have adjustable louvers and are available with and without filters. Return air filters should be cleaned regularly. The filter shipped with your SeaMach unit is located in front of the air coil can be cleaned with a vacuum cleaner or rinsed with fresh water. If your unit’s return air grille has a filter, be sure that your boat builder or installation technician has removed the standard filter that comes with every unit in front of the evaporator (air) coil. Two filters can unduly restrict air flow and in some cases, cause problems with performance. Use EITHER a return air filter grille or the supplied filter, never both. Depending upon the floor plan, your boat’s space constraints may dictate that a unit be installed in an area that makes it difficult to access and clean the filter. If this is the case, and you do not have a return air filter grille, you should consider removing the disposable unit filter and upgrading to a return air filter grille. NOTE: Blocking the return air grille of neglecting filter cleaning will result in a restriction of air flow. In the heating mode, this will cause a HIGH PRESSURE FAULT shutdown. In the cooling mode, after a period of time, you will experience icing of the evaporator coil and a resultant LOW PRESSURE FAULT shutdown. Supply Air Grille(s) Most installations will have more than one supply air grille. Standard main supply air grilles are generally made of aluminum or wood frames with two or four-way adjustable louvers. These may be adjusted to direct air flow from the grille to ensure a uniform cabin temperature. Main supply air grilles should never be closed at any time while running in either the heating or cooling modes. Secondary supply air grilles more frequently will be a 4” round plastic design, but they can also be of the aluminum or wood frame standard configuration and are usually located out of the main salon, galley, dinette area. These may, depending upon the style you or your boat manufacturer has chosen, be closable. During the day, these may be closed should you like more air directed to the main living area. Consult with your local SeaMach service representative if you are unsure which are the main supply grilles on your boat. Closing off the main supply air grille or secondary air grilles, in some applications, may restrict air flow and cause ice up of the evaporator in the cooling mode or high pressure fault shut down in the heating mode. Should either of these conditions occur, open all closed supply air grilles and restart system. This should eliminate the problem. If the problem recurs again, consult your local SeaMach service representative. SeaMach Owner’s Manual 5/05 Page 4 of 24
SeaMach Reverse Cycle Air Conditioners Chapter 3 - General Description The SeaMach line of reverse cycle air conditioners built by Marvair® are self-contained, water-cooled units designed for use with either fresh or seawater. The SP models are built in various sizes with capacities from 5,000 to 24,000 BTUH. Both 115 volt and 230volt models are available. The S*M models are designed to be used with a 24 volt wall mounted thermostat. The S*B models have an electronic control board which allows the use of a multifunction MachAir OLED thermostat/controller. SP models use R-22 refrigerant, SC models use R-407c refrigerant. Operating Ranges The SeaMach reverse cycle air conditioner is designed to operate in the heating mode with a minimum inlet water temperature of 60°F (15°C) and in the cooling mode with a maximum inlet water temperature of 100°F (38°C). Heating Cooling Max. Water Temperature 85°F (29°C) 100°F (38°C) Min. Water Temperature 50°F (10°C) 60°F (15°C) Max. Entering Air Temperature 78°F (25°C) 95-115°F* (35°C – 46°C*) Min. Entering Air Temperature 55-65 °F* (12°C – 18°C*) 68°F (19°C) * Depends upon inlet water temperature and relative humidity. General Operation The SeaMach reverse cycle air conditioner has both a heating and cooling mode of operation. It uses R-22 or R407c refrigerant in a conventional vapor compression cycle to transfer heat from the air in the boat to the water. In the cooling mode, a blower blows the cabin air through the indoor or evaporator coil where it is cooled and dehumidified. Liquid refrigerant passing through the evaporator is boiled into a gas by heat removed from the air. The warmed refrigerant gas enters the compressor where its temperature and pressure are increased. The hot refrigerant gas travels to the water coil or condenser where it is cooled by the water and condenses to a liquid. Liquid refrigerant is metered back into the evaporator coil to repeat the process. In the heating mode, the process is reversed. A special reversing valve reverses the flow of the refrigerant throughout the system exchanging the roles of the condenser and evaporator. The refrigerant flows through the water or evaporator coil, picks up heat from the water, and becomes a vapor. The vapor then enters the compressor where it is compressed to a higher temperature. It is then pumped to the indoor coil where the air moving across the coil picks up the heat and the warm air is blown into the room. The compressed refrigerant vapor condenses to a liquid as it gives up heat. Finally, liquid refrigerant flows into the capillary tubes into the indoor coil where the cycle is repeated. The SeaMach reverse cycle air conditioner is controlled by a thermostat or controller mounted on the wall. SeaMach Owner’s Manual 5/05 Page 5 of 24
Page 1 and 2: SeaMach Self-contained Reverse Cycl
Page 3: SeaMach Reverse Cycle Air Condition
Page 7 and 8: SeaMach Reverse Cycle Air Condition
Page 23 and 24: Parts SeaMach Reverse Cycle Air Con

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